The Optical/IR Counterpart of the 1998 July 3 Gamma-Ray Burst and Its Evolution | Zendy

A. J. Castro–Tirado | Zendy; M. R. Zapatero Osorio | Zendy; J. Gorosabel | Zendy; J. Greiner | Zendy; J. Heidt | Zendy; D. Herranz | Zendy; S. N. Kemp | Zendy; E. Martínez-González | Zendy; A. Oscoz | Zendy; V. G. Ortega | Zendy; H.-J. Röser | Zendy; Christian Wolf | Zendy; H. Pedersen | Zendy; A. O. Jaunsen | Zendy; H. Korhonen | Zendy; I. Ilyin | Zendy; R. Duemmler | Zendy; M. I. Andersen | Zendy; J. Hjorth | Zendy; A. A. Henden | Zendy; F. J. Vrba | Zendy; J. W. Fried | Zendy; F. Frontera | Zendy; L. Nicastro | Zendy

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The Optical/IR Counterpart of the 1998 July 3 Gamma-Ray Burst and Its Evolution

Author(s) -

A. J. Castro–Tirado,

M. R. Zapatero Osorio,

J. Gorosabel,

J. Greiner,

J. Heidt,

D. Herranz,

S. N. Kemp,

E. Martínez-González,

A. Oscoz,

V. G. Ortega,

H.-J. Röser,

Christian Wolf,

H. Pedersen,

A. O. Jaunsen,

H. Korhonen,

I. Ilyin,

R. Duemmler,

M. I. Andersen,

J. Hjorth,

A. A. Henden,

F. J. Vrba,

J. W. Fried,

F. Frontera,

L. Nicastro

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311846

Subject(s) - gamma ray burst , physics , hypernova , astrophysics , galaxy , light curve , afterglow , supernova , flux (metallurgy) , infrared , power law , astronomy , statistics , mathematics , metallurgy , materials science

We imaged the X-ray error box of GRB 980703, beginning 22.5 hours after thegamma--ray event, in both the optical R and near-infrared H bands. A fadingoptical/IR object was detected within the X-ray error box, coincident with thevariable radio source reported by Frail et al. (1998a), who also detected theoptical transient independently of us. Further imagery revealed the GRB hostgalaxy, with R = 22.49 +/- 0.04 and H = 20.5 +/- 0.25, the brightest so fardetected. When excluding its contribution to the total flux, both the R andH-band light curves are well-fit by a power-law decay with index alpha~1.4. Ourdata suggest an intrinsic column density in the host galaxy of ~ 3.5 x 10^21cm^-2 which indicates the existence of a dense and rich-gas medium in which theGRB occurred, thus supporting the hypernova model scenarios.Comment: Accepted for publication in Astrophysical Journal Letter

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